TBF the original post didn't talk about the length of the grand final, nor did it talk about halftimes or weekend tournaments. Just that map advantage sucks and the UB winner should only get a map pick advantage in the pick ban process. This would make GFs longer on average actually, so this grand finals take too long isn't even really relevant.
Also GFs taking too long is only a problem for invite as everyone else just does a Bo3, so its not like this a huge problem and its only gonna affect 12 players max each season (who happen to be the most dedicated to playing this game).
And if you're gonna suggest that players can give up a weekend to play GF + all other playoff matches, then idk how you can't assume that they can stay up late (which they already do routinely to scrim) one night of the season (assuming they make it to GF's in the first place).